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Freedoom not recognized

So, under Other Games there is Doom64 Absolution, and Freedoom (phase 1 and phase2); I have added the folders in which the wad files are located to the wad-locations under mods; and the wads now show up in the list of mods. Doom64 Absolution is found automatically by DE just fine; however, freedoom is not.

Possible, but now that I think about it, this isn't limited to FreeDoom; over in the Heretic section there's someone whose Doomsday doesn't recognize the Steam Heretic wad; where with me it does recognize that, but Doomsday doesn't recognize the Hexen expansion.